Carburetor



April 19, 1927. w. T. SIMPSGN CARBURETOR Original Filed 00h21 1920 /Iy m *1i asv- Patented Apr. 19, 19727.

, .UNlTAE-D- STATES 1,625,574 :es Fries.

WARD |11. SIMPSON, or' GRAND RAPIDS, ivrrcirrGAN,iissi`c-N0R, ,MRSNE AssiGNMEN'rS,

To ALBERT G. DICKINSGN, er eRaND RAPIDS, MrcnreAN.

CARBURETOR.

' 'Appncaaanme oetober 21,*1'920, Serial No. 4is-,422 renewed February 2, i927.

One object of 'the'p'resent invention is to provide a carburetor having a vacuum fuel chamber "for drawing in its own fuel and a fuel nozzle'V arrangement adapting the organization for use where a horizontal type of mixing chamber is desired.

Otherobjects of the invention will appear from the"following description.

In the drawings:

Figure 1 is a sectional view of the carburetor'ta'ken longitudinally of the mixing chamber and nozzle. y

Fig. 2 is a viewpartly in section and at right angles to Fig. 1 and on line 2-2 of Fig. 1.

Fig. 3 is a detail showing a section along the air and fuel tubes. Fig. Il shows the system on a car.

In these drawings 1 indicates a fuel chamber provided with a float 2 and a valve 3 controlled thereby, said valve being balanced by the depression within the fuel chamber.

From this fuel chamber a vacuum passage 4 extends, said passageY at its end being defined by a wall surrounding a horizontal tube la forming theV mixing chamber. This vacuum passage connects with the engine manifold by a narrow annular passage 5 surrounding the discharge end of the mixing tube. The fuel nozzle comprises an air nozzle 6 having an outwardly flared inlet opening Tand an outwardly flared outlet opening 8, these walls defining the central bore sloping to the contracted intermediate area 9, at which the end of the fuel pipe 10 is located. n This fuel pipe is inserted laterally through the nozzle and it has its end bevelled off so that its high point 11 is nearest to the inlet, from which point its edge slopes downwardly at an inclination to the axis of the nozzle and towards the outlet end. The end of the pipe at all points is above the inner wall of the nozzle. This fuel pipe extends through a bracket 12 which extends across but is spaced apart from the intake opening of the mixing chamber tube, and affords a seat for an annular throttle valve B which surrounds the exterior of the tube 4a and is movable in the direct-ion of its axis to and from its seat. The angular end o-f the fuel pipe provides for aspiration of the fuel by the inflowing air.

Provision is made for introducing air into the fuel pipe to control the amount of fuel liowing therethrough to meet the various conditions of operation and for this purpose an air pipe extends into the nipplel13 carried by the bracket 12 and communicates with the interior of the fuel pipe. This air metering pipe is arranged kat an inclination upwardly and outwardly from thefuel kpipe as shown in Fig. 3 and there will be no tendency for air bubbles to lodge or pocket infits linlet to the fuel pipe and thus interfere with the proper flow of fuel to the nozzle. This air tube is controlled by a valve 15, which lits a long tapered seat at 16.

Air is introduced into the fuel pipe at all times except in starting, at which time it is shut off. This may be done by any suitable connection leading to the seat of the driver.

Such connections are old and well known and are not shown herein. Instead of arranging the fuel pipe at right angles to the axis of the nozzle, I may Varrange it on an inclination thereto, butin any event the end of the fuel pipe will enter the bore of the nozzle and the plane of its end face will be at an inclinati-on to the axis with its highest point or tip nearest to the inlet, so that the end face will slope downwardly towards the inner end of the nozzle.

I provide a drain hole at 14 leading from the vacuuln passage to the fuel chamber, so that if any liquid precipitates on the walls it will be led back to the fuel supply.

It will be noticed that there is considerable restriction at the point a between the tip/ of the fuel pipe and the wall of the nozzle. This gives high velocity to the air at this point and from this point the space gradually enlarges. Depression at the discharge opening of the fuel pipe is created for forcibly drawing in the fuel. tion is also obtained at Z; between the lip of the air nozzle and the wall of the mixing tube by reason of the outward flare of the discharge end of the nozzle.

At idling position a high velocity is obtained at the. end of the fuel pipe and practically no velocity at the outside restriction b because there is little air passing at this time, the throttle valve being nearly closed.

The depression in the fuel chamber and outlet of the nozzle is practically the same at the idling period, but it is the greatest at the outlet of the nozzle, thereafter depending on the flow of air at the restriction 7J.

Restricf Any oriflinfufy set ot connections muy be t employed tor operating the throttle vulve.

l. ln e carburetor, the Combination oit :i fuel bowl having un upward extension with :t tube extending horizontally through seid extension, Supported by the well thereotl und ltorlning between itsellf :uid u port of Suid e. ensiou u` siufrounding chzunber l und with o retricted annuler passage u ring elntped throttle valve slidebly mounted on the e2;- tenvion ot' Suid horizontal tube, e bracket extending* troni the lower part ot the fuel bowl upwardly und having e seat portion opposite the seid horizontal tube und serving :te u, sont lor the ring shaped throttle vulve, zi nozzle extending troni Suid sont portion into the horizontal tube, seid nozzle having its Central openingl continued through the sont portion, und an o-il supply conduit eztei'idine` through the brzielet and discharging into the nozzle, substantially als described.

2. In u carburetor, the combination ot A` tuel bowl having un upward extension providing :L passage eoniniuniouting the bowl above its fuel level with the engine intake, u tube extending horizontally into sind pus- .eagd und supported in said extension, und haring un ond portion projecting from zuid extension, u ring shaped throttle Valve Slid- :ioly niounted on the projecting end ot Suid horizontal tube, u bracket extending,1V troni the lower peut o'l the t'uel bowl upwardly :ind having u. seat portion opposite the said horizontal tube and serving es zt seat tor the ringw :shuped throttle vulve, u nozzle extending` troni Suid seat portion into the horizontal tube, Suid nozzle having its control opening Continued through the neet portion, and un oil supply conduit extending through the bracket und discharging into the nozzle, substantially as described.

In testimony whereof, I :lftlix my signztture.

WARD T. SIMPSON. 

